The Calendar hole will go live in approximately 13 days. Why not try and solve it ahead of time?
Farey Sequence in all languages in bytes. Achievements Cheevos Holes Languages Medals Miscellaneous All Holes 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial All Languages ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Bytes Chars Scoring Bytes Chars Language All ><> Assembly AWK Bash BASIC Berry brainfuck C C# C++ Civet Clojure COBOL Coconut Common Lisp Crystal D Dart Elixir Erlang F# Factor Forth Fortran Gleam Go GolfScript Groovy Haskell Hexagony J Janet Java JavaScript jq Julia K Kotlin Lua Nim OCaml Pascal Perl PHP PowerShell Prolog Python R Raku Rockstar Ruby Rust Scheme sed SQL Swift Tcl TeX V VimL Wren Zig Experimental Language 05AB1E ALGOL 68 APL Arturo Befunge BQN CJam CoffeeScript Egel Fennel Harbour Hare Haxe Hush Hy iogii Knight Luau Odin Picat Qore Racket Rebol Rexx Scala Squirrel Stax Uiua Umka Vala Vyxal Hole All 12 Days of Christmas 24 Game 99 Bottles of Beer Abundant Numbers Abundant Numbers (Long) Arabic to Roman Arithmetic Numbers Arrows Ascending Primes ASCII Table Billiards brainfuck Card Number Validation Catalan Numbers Catalan’s Constant Christmas Trees Collatz CSS Colors Cubes Day of Week DFA Simulator Diamonds Divisors Emirp Numbers Emirp Numbers (Long) Emojify Evil Numbers Evil Numbers (Long) Factorial Factorisation Farey Sequence Fibonacci Fizz Buzz Foo Fizz Buzz Bar Forsyth–Edwards Notation Fractions Game of Life Gijswijt’s Sequence Happy Numbers Happy Numbers (Long) Hexdump Hilbert Curve Intersection Inventory Sequence ISBN Jacobi Symbol Kaprekar Numbers Kolakoski Constant Kolakoski Sequence Leap Years Levenshtein Distance Leyland Numbers ln 2 Look and Say Lucky Numbers Lucky Tickets Mahjong Mandelbrot Maze Medal Tally Minesweeper Morse Decoder Morse Encoder Musical Chords N Queens Niven Numbers Niven Numbers (Long) Number Spiral Odious Numbers Odious Numbers (Long) Ordinal Numbers PalindromemordnilaP Pangram Grep Partition Numbers Pascal’s Triangle Pernicious Numbers Pernicious Numbers (Long) Poker Polyominoes Prime Numbers Prime Numbers (Long) Proximity Grid QR Decoder Quine Recamán Repeating Decimals Reverse Polish Notation Reversi Rijndael S-box Rock-paper-scissors-Spock-lizard Roman to Arabic ROT13 Rule 110 Scrambled Sort Set Seven Segment SI Units Sierpiński Triangle Smith Numbers Spelling Numbers Star Wars GPT Star Wars Opening Crawl Sudoku Sudoku (Fill-in) Ten-pin Bowling Tic-tac-toe Time Distance Tongue-twisters Topological Sort Tower of Hanoi Transpose Sentence Trinomial Triangle United States Vampire Numbers Van Eck Sequence Zeckendorf Representation Zodiac Signs γ λ π τ φ √2 𝑒 Experimental Hole Apéry’s Constant Binary Lambda Calculus Calendar Connect Four Continued Fractions Crossword CSS Colors (Inverse) CSS Grid Ellipse Perimeters Flags Floyd-Steinberg Dithering Gray Code Decoder Gray Code Encoder Hexagonal Spiral Highly Composite Numbers Multitap Input NFA Simulator Numbrix Odd Polyomino Tiling p-adic Expansion Polygon Triangulations QR Encoder Quadratic Formula Semiprime Numbers Smooth Numbers Snake Sphenic Numbers Taxicab Numbers Turtle Tutorial # Golfer Points Bytes Time Submitted 639th msbranicky 676 94 11ms 1 Jan 2024 639th InigoK 🇺🇸 676 94 10ms 29 Aug 2025 643rd MeWhenI 🇻🇦 675 82 6ms 1 Dec 2023 644th the-zammers 674 108 129ms 15 Dec 2023 645th Shanethegamer 🇺🇸 673 106 14ms 31 Jan 2024 645th AlephSquirrel 673 106 11ms 24 Jun 2024 647th kmathis22 670 113 542ms 12 days ago 648th janbehrens 🇩🇪 669 95 11ms 1 Dec 2023 648th wuzekai518 669 95 11ms 16 Jul 2024 648th CoolBvll 669 95 10ms 13 Jun 2025 648th Techdude01 669 95 11ms 14 Aug 2025 652nd luuumine 🇫🇷 668 120 113ms 19 Nov 2025 653rd janbehrens 🇩🇪 667 83 6ms 1 Dec 2023 654th Babafaba 667 92 480ms 22 Oct 2025 655th Ripick 665 94 120ms 24 Jun 2024 656th HumanoidCPU 665 114 428ms 8 Nov 2025 657th NickTheEASDude 🇺🇸 664 87 10ms 25 Apr 2024 658th BREMAUCY 🇫🇷 663 106 83ms 4 Dec 2023 659th Creative0708 🇨🇦 662 121 126ms 16 Dec 2023 659th mousetail 🇳🇱 662 121 128ms 24 Mar 2024 661st MichalMarsalek 🇨🇿 658 95 140ms 1 Dec 2023 662nd luuumine 🇫🇷 658 98 2ms 19 Nov 2025 663rd tobeannouncd 656 111 128ms 11 Jan 2024 664th MeWhenI 🇻🇦 654 191 9ms 1 Dec 2023 665th msbranicky 653 94 451ms 17 Jan 2024 666th MeWhenI 🇻🇦 650 84 5ms 16 Aug 2024 667th bac0id 649 98 11ms 10 Jan 2025 667th Troon 649 98 10ms 18 Feb 2025 669th dokutan 648 149 319ms 10 Dec 2024 670th alomiF 644 113 152ms 6 Dec 2023 671st snoozingnewt 🇨🇦 643 150 270ms 15 Oct 2025 672nd Ripick 642 99 10ms 1 Dec 2023 672nd firegene 🇮🇪 642 99 11ms 3 Dec 2023 672nd hellwue 642 99 11ms 22 Feb 2024 675th jbt 641 90 10ms 24 Dec 2023 676th Daniel-Ellison 639 78 786ms 8 Aug 2025 677th Yewzir 🇧🇪 639 92 137ms 27 Mar 2024 678th elgan65536 639 101 2ms 5 Dec 2023 678th madex 🇩🇪 639 101 2ms 13 Feb 2024 678th Herbert00709 🇵🇱 639 101 2ms 3 Sep 2024 681st snoozingnewt 🇨🇦 639 110 84ms 15 Oct 2025 682nd gifti258 637 99 75ms 8 Aug 2025 683rd janbehrens 🇩🇪 634 91 9ms 1 Dec 2023 683rd eranws 634 91 10ms 16 Mar 2024 685th northsuperman 633 102 2ms 24 Mar 2024 686th dokutan 633 104 2ms 26 Oct 2024 687th Yewzir 🇧🇪 633 111 84ms 5 Feb 2024 687th HumanoidCPU 633 111 83ms 5 Jun 2024 689th lifthrasiir 🇰🇷 629 46 3ms 5 Dec 2024 690th IISResetMe 629 67 804ms 4 Dec 2023 691st 051 🇸🇬 629 101 11ms 24 Dec 2023 692nd snoozingnewt 🇨🇦 624 109 109ms 19 days ago 693rd msbranicky 624 235 1,619ms 16 Sep 2025 694th WillConker 623 102 26ms 10 Mar 2024 694th FlorianCassayre 🇫🇷 623 102 11ms 18 May 2024 696th two-bad 🇬🇧 621 93 9ms 5 Feb 2024 696th helbling 🇨🇭 621 93 10ms 16 Jun 2024 696th thisishowmymindworks 🇳🇴 621 93 11ms 28 Jun 2024 699th iczelia 🇩🇪 620 104 2ms 10 Oct 2025 700th dokutan 619 237 1,728ms 19 Oct 2025 701st markusgraube 617 103 10ms 22 Jun 2024 702nd msbranicky 617 154 25ms 3 Jan 2024 703rd MeWhenI 🇻🇦 616 105 13ms 1 Dec 2023 704th Steffan153 🇫🇮 616 123 390ms 5 Dec 2023 704th Lydxn 🇨🇦 616 123 377ms 16 Dec 2023 706th Andrey-Plotnikov 614 94 10ms 13 Jan 2025 707th bac0id 614 139 670ms 10 Jan 2025 708th Shanethegamer 🇺🇸 613 68 47ms 1 Dec 2023 709th FortuiteMan 🇫🇷 613 98 13ms 10 hours ago 710th Maximizer02 613 113 13ms 7 Nov 2024 711th dokutan 613 155 25ms 20 Apr 2025 712th KadinSchultz 611 104 9ms 4 Dec 2023 712th cros107 🇦🇺 611 104 10ms 26 Dec 2023 712th dokutan 611 104 12ms 28 Oct 2024 715th HumanoidCPU 608 95 10ms 16 Nov 2025 716th uttumuttu 🇫🇮 608 101 90ms 21 Dec 2023 717th msbranicky 606 116 81ms 2 Jan 2024 718th h3ra993huskp 🇯🇵 606 125 469ms 18 days ago 719th madex 🇩🇪 605 105 11ms 21 May 2024 720th dokutan 604 134 414ms 27 Sep 2025 First Prev 641–720 of 1,484 Next Last